A cationic dyeable pet and composite elastic fiber made therefrom
A composite elastic fiber and cation technology, applied in the field of composite elastic fibers, can solve the problems of easy dyeing, deactivation of transesterification catalysts, affecting the color of PET products, etc., to avoid side reactions.
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Embodiment 1
[0054] The present embodiment provides a preparation method of cationically dyeable PET, which comprises the following steps:
[0055] Put titanium dioxide, terephthalic acid and ethylene glycol in a beating kettle, stir and mix at 100 ° C, increase the stirring speed from 500 r / min to 1500 r / min within 10 minutes, and then keep at 1500 r / min for 45 minutes, complete The slurry is prepared by beating, wherein the mass fraction of titanium dioxide in the slurry is 1.0%, and the molar ratio of terephthalic acid and ethylene glycol is 1:1.10.
[0056] Using nitrogen as the protective gas, the slurry was esterified. The esterification pressure was controlled to be 0.40MPa, the esterification temperature was 235°C, and the esterification time was 2.0h. , Esterification under normal pressure conditions for 1.0h, the esterification is completed, and the esterification product is prepared.
[0057] The esterification product is subjected to pre-polycondensation reaction, the temperat...
Embodiment 2
[0064] The present embodiment provides a method for preparing a cationically dyeable PET / PTT composite elastic fiber, which comprises the following steps:
[0065] The cationic dyeable PET and conventional PTT provided in Example 1 were melt-extruded through a screw, and then formed by a composite melt-spinning assembly to prepare a cationic dyeable PET / PTT composite elastic fiber. In the PET / PTT composite elastic fiber, The mass ratio of conventional PTT to cationically dyeable PET is 40:60.
[0066] When preparing PET / PTT composite elastic fiber, it can be made into composite elastic POY fiber or composite elastic DTY fiber; wherein,
[0067] The preparation process of composite elastic POY fiber includes: preparing cationically dyeable PET melt and PTT melt respectively - entering the spinning box - entering the spinning assembly - cooling and solidifying - winding and forming;
[0068] The melt enters the spinning box stage, and the temperature of the PET spinning box is ...
Embodiment 3
[0076] The present embodiment provides a preparation method of cationically dyeable PET, which comprises the following steps:
[0077] Put titanium dioxide, terephthalic acid and ethylene glycol in a beating kettle, stir and mix at 110°C, increase the stirring speed from 500r / min to 1500r / min within 10min, and then keep at 1500r / min for 45min, After the beating is completed, a slurry is prepared; wherein, the mass fraction of titanium dioxide in the slurry is 1.5%, and the molar ratio of terephthalic acid to ethylene glycol is 1:1.20.
[0078] Using nitrogen as the protective gas, the slurry was esterified. The esterification pressure was controlled to be 0.45MPa, the esterification temperature was 245℃, and the esterification time was 3.0h. , Esterification under normal pressure conditions for 1.5h, the esterification is completed, and the esterification product is prepared.
[0079] The esterification product is subjected to pre-polycondensation reaction, the temperature of...
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